/Engine/Source/Runtime/Landscape/Public/LandscapeEditTypes.h
namespace UE { namespace Landscape { enum EOutdatedDataFlags { None = 0, GrassMaps = (1 << 0), PhysicalMaterials = (1 << 1), NaniteMeshes = (1 << 2), All = (GrassMaps | PhysicalMaterials | NaniteMeshes ), } } }